It is in Lake County, but I can't remember exactly how to get there. I mountain biked there once many years ago (when I still rode my mountain bike). It was pretty for a demonstration forest (better than Jackson State Forest in Mendocino). But there were pine/redwood needles all over the trails and you had to be careful not to slip.
Thank you Velogirl for the suggestion about other postings. I guess it's even more obvious now that I'm not a cross rider.
"Bicycling is a big part of the future. It has to be. There's something wrong with a society that drives a car to workout in a gym." -- Bill Nye